The passport of a Melbourne schoolboy apparently killed carrying out a suicide bombing in Iraq overnight was cancelled in October last year, just months after the teenager left Australia to fight with Islamic State.

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"The Australian authorities have had reason to have Mr Bilardi under surveillance for quite some time however when he started in Iraq and Syria with ISIL and Daesh, it's very hard for us to keep track of him," the minister said, referring to the other names for terrorist group Islamic State.

"The terrorist organisation preys on vulnerable people, they prey on vulnerable young people in particular – they promise them some kind of redemption or martyrdom but the fact is it is a senseless and cruel and violent end for many of them.

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"And if Jake Bilardi is another example of this then the tragedy deepens futher," Ms Bishop said.

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There are currently 90 Australians citizens believed to be fighting with Islamic State and 20 have been killed.

Ms Bishop says under her powers as the Foreign Minister, she has cancelled the passports of 100 Australians who security agencies fear want to join and fight with Islamic State.

"So that's 100 people who haven't gone overseas who we believe were seeking to go to Iraq and Syria and join in this conflict," the minister said.

"I've also refused to issue a number of passports," Ms Bishop added.

The government is seeking a briefing from national security and law enforcement agencies regarding media reports homemade bombs were found in Mr Bilardi's Melbourne home by his family after he left the country.

The minister said foreign fighters are the government's "highest national security priority" because they fear they will return home and attempt to carry out attacks.

The government will ask social media companies including Facebook and Twitter to take down more Islamic State propaganda to try and stop it from reaching impressionable young Australians at risk of being radicalised.